Title:
Shot-noise evidence of fractional quasiparticle creation in a local fractional quantum Hall state

Abstract: We have experimentally identified fractional quasiparticle creation in a
tunneling process through a local fractional quantum Hall (FQH) state. The
local FQH state is prepared in a low-density region near a quantum point
contact (QPC) in an integer quantum Hall (IQH) system. Shot-noise measurements
reveal a clear transition from elementary-charge tunneling at low bias to
fractional-charge tunneling at high bias. The fractional shot noise is
proportional to T1(1 ? T1) over a wide range of T1, where T1 is the
transmission probability of the IQH edge channel. This binomial distribution
indicates that fractional quasiparticles emerge from the IQH state to be
transmitted through the local FQH state. The study of this tunneling process
will enable us to elucidate the dynamics of Laughlin quasiparticles in FQH
systems.